By Dr. Robert Guderian (auth.)
Emissions of gaseous air toxins have elevated within the final years even with elevated controls and obstacle for air caliber. Predictions of destiny improvement additionally point out extra elevate in emissions has to be anticipated. From an intensive research of gas use in traditional energy crops in and for household heating, Brocke and Schade (1971) and Schade (1975) expect that sulfur dioxide (S02) emissions within the Federal Republic of Germany increases from '3. five million t in 1969, over four. 2 million t in 1973, to four. 6 million t in 1980. Rasch (1971) predicts that emission of hydrogen chloride (HCI) from burning of wastes increases from a gift 8000 t/year to approximately one hundred thousand t in 1980. Emission of gaseous fluoride compounds, in North Rhine Westphalia by myself, are anticipated to extend from 7500 t in 1969 to 8800 t in 1985 (MAGS, 1972). related predic tions have additionally been made within the united states (Heggestadt and Heck, 1971). A doubling of S02 emissions from oil and especially coal-fired energy vegetation is predicted among 1960 and 1980 (Wood, 1968; Lewis et aI. , 1974). whilst it truly is thought of that overall regulate of air pollution is technically and particularly economically very unlikely, it is vital that, sooner or later, emissions are managed inside a technical and fiscal framework to such an quantity that ambient pollutant concentrations close to the floor current no threat to guy or his surroundings (BImSchG, 1974).
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Additional resources for Air Pollution: Phytotoxicity of Acidic Gases and Its Significance in Air Pollution Control
8 mg SOlim3 air for different times. 8mg Sal Experiments demonstrate that recovery can occur during pollutant-free periods. However, at a particular concentration, such a recovery is only possible when a definite exposure duration has not been exceeded. In agreement with Zahn (1961, 1963 a), who investigated the influence of intermittent fumigations on leaf injury, it has also been shown that pollutant-free periods must reach a certain minimum to allow recovery. The less severe effects observed in experiments with intermittent exposures to constant S02 concentrations are not due to reduced pollutant uptake_ In general, S-accumulation increases with an increase, up to a certain frequency, in pollutant impulses (Guderian, 1970).
250 . - 100 I Appar. photosynthesis ~ 5 - accumulation Leaf injury 150 Extent of leaf injury in '10 (oldest leaf =100) I 80 60 40 - ~ 25 20 29 33 38 Extent of leaf injury in '10 Appar. photosynthesis (mg CO 2 /dm 2 ·h) 10 ,--,------,---,----,----,-----,---------, 100 8 80 ~_4------~~-+----+7~~~----+_--------+ 60 40 2 7 14 11 20 17 24 30 Extent of leaf injury in '10 Appar. photosynthesis (mg CO2 /dm 2 . h) 10 8 2 100 Y/ ~~ I / 6 4 20 ~_4------+_---+~~+_---,----~+_--------+ II Leaf \ injury \ '" --Appar.
The daily rhythms in pollutant accumulation and in plant sensitivity are essentially light-dependent processes. In fumigation experiments in the field Katz (1949), Thomas (1951), and Zahn (1963 b) have shown that plants respond differently to the same S02 concentration at various times of day. Van Haut (1961) has observed a daily rhythm even under constant light intensity, temperature and humidity conditions. HCl accumulation, however, varied only sightly under constant growth chamber conditions, as shown in Table 7.
Air Pollution: Phytotoxicity of Acidic Gases and Its Significance in Air Pollution Control by Dr. Robert Guderian (auth.)
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